Montana Payroll Taxes and Withholding Guide (2026)

What Makes Montana Payroll Different

Federal payroll tax is the same in every state. What changes from one state to the next is the second layer: state income tax withholding, employer unemployment taxes, any local wage taxes, and any state social-insurance premiums. Montana's second layer is a two-rate income tax, and almost nothing else on the employee side.

Two things set Montana apart. First, Montana rebuilt Form MW-4 in 2025 and removed withholding allowances entirely; you mark a marital status and the federal standard deduction is already built into the table's zero-tax band. Second, Montana has a reciprocity agreement with North Dakota, so a North Dakota resident working in Montana is not taxed by Montana. Otherwise the state side is clean: no local wage tax, no state disability or paid family leave deduction, and no employee unemployment line. The federal baseline behind all of this is explained in the how payroll taxes work guide.

Employee Withholding Overview in Montana

A Montana employee sees federal taxes and a two-rate state income tax. There is no employee unemployment line, no state disability or paid-leave line, and no local wage line; the only state item is the income tax.

The federal lines work identically to any other state. For Social Security, the 2026 wage base is $184,500, after which Social Security stops for the year. Medicare has no cap. What is unique to Montana is a two-rate state income tax withheld on the Form MW-4 marital status, and nothing else on the state side.

How Is Montana State Income Tax Withheld?

Montana uses the percentage method in the Department of Revenue Employer and Information Agent Guide. The employer takes the gross wages for the payroll period (after pre-tax deductions), applies the two-rate schedule for the employee's Form MW-4 marital status, and rounds the result to the nearest dollar. Equivalently, the annualized method annualizes wages, applies the annual table, and divides across pay periods. The single-status annual chart below applies for 2026. The first band is a zero-tax band that builds in the federal standard deduction, so the standard deduction is not subtracted separately.

Married-filing-jointly and head-of-household filers use the same rates on wider bands; the married zero-tax band is $32,200 (then 4.7% to $127,200, then $4,465 + 5.65%) and the head-of-household band is $24,150 (then 4.7% to $95,400, then $3,349 + 5.65%) for 2026. For 2025 the top rate was 5.9% on narrower brackets; the Montana paycheck calculator uses the 2025 schedule and reproduces the Department of Revenue tables to the dollar. Your final Montana income tax is settled on Montana Form 2. The Form MW-4 marital status sets Montana withholding; the federal Form W-4 sets federal withholding, covered in the W-4 withholding explained guide.

Montana Removed Withholding Allowances

This is the layer that redefined Montana withholding in 2025: Form MW-4 no longer uses allowances. The employee marks a marital status box, and the federal standard deduction for that status is built into the table's zero-tax band. There are no personal or dependent exemptions to add or subtract, and withholding rounds to the nearest dollar.

Because allowances are gone, the only choices on Montana's Form MW-4 are the marital status and an optional extra dollar amount. A married couple where both spouses work should mark line 2, which routes their wages through the single table (narrower $15,000 zero-tax band for 2025, $16,100 for 2026); otherwise each employer withholds on the wider married band and the couple can under-withhold. To see how the marital status changes take-home pay, use the Montana paycheck calculator.

Montana's 2026 Rate Cut (House Bill 337)

Montana moved to a two-rate income tax, and House Bill 337 (2025 session) lowers the top rate and widens the lower bracket beginning January 1, 2026. The 4.7% lower rate stays, but the point where the top rate kicks in moves up, and the top rate itself drops. The bill lowers the top rate again in 2027.

For 2026 the 4.7% rate applies to taxable income up to $47,500 for single and married-filing-separately filers, $71,250 for head of household, and $95,000 for joint filers, with the top 5.65% rate above those points. Because the standard deduction is built into the withholding table's zero-tax band, the 2026 single table runs 0% to $16,100 of wages, 4.7% to $63,600, then 5.65%. The Montana paycheck calculator uses the 2025 schedule (5.9% top rate); 2026 withholding on the same wages is slightly lower.

Montana Has Reciprocity With North Dakota

Montana and North Dakota have a reciprocal income tax agreement, the only one Montana maintains. Under it, wages are taxed only by the worker's home state, so cross-border commuters are not double-withheld.

A North Dakota resident who works in Montana is not taxed by Montana on those wages; the Montana employer does not withhold Montana income tax once reciprocity is on file. In the other direction, a Montana resident who works in North Dakota files North Dakota Form NDW-R with the North Dakota employer to stop North Dakota withholding, and pays Montana tax on the wages instead. A resident of any other state who works in Montana has Montana income tax withheld and files a Montana nonresident return (Form 2), then claims a credit for the Montana tax on their home-state return so the same wages are not taxed twice.

Employer Payroll Obligations in Montana

Montana employers carry the federal employer taxes plus State Unemployment Insurance through the Montana Department of Labor and Industry. The federal side, covered in the employer payroll tax obligations guide, includes the matching 6.2% Social Security and 1.45% Medicare plus Federal Unemployment Tax (FUTA).

The Montana unemployment taxable wage base is $47,300 per employee for 2026 (up from $45,100 in 2025), so the employer unemployment tax stops once an employee's year-to-date wages pass $47,300. New employers pay an industry-based new-employer rate (roughly 1% to 2%) before moving to an experience-rated rate; these are employer costs and are never deducted from employee pay. Montana wage withholding is reported and paid on a schedule set by the amount withheld, with an annual reconciliation on Form MW-3, and unemployment is reported quarterly. Model the combined cost-to-hire with the employer payroll tax calculator.

Montana Has No Employee Unemployment Deduction

A handful of states, including Pennsylvania and New Jersey, take a small unemployment contribution directly from employee wages. Montana is not one of them. The entire cost of Montana unemployment insurance falls on employers through the Department of Labor and Industry, so there is no employee unemployment line on a Montana pay stub.

Montana also has no state disability insurance and no paid-family-and-medical-leave payroll deduction, so the only employee-side state item is the income tax. This matters most for workers who move to Montana from a state that does deduct one of those (California SDI, Washington PFML, New Jersey UI/DI) and expect to see the same line. In Montana those lines do not exist.

Montana Supplemental Wage Withholding

Supplemental wages are payments outside regular salary: bonuses, commissions, overtime, sales awards, and back pay. Montana's Employer and Information Agent Guide handles them through the regular tables rather than a separate flat rate.

• Aggregate method: supplemental wages are withheld based on the total of the regular and supplemental wages for the payroll period, using the same MW-4 percentage-method tables.
• No separate flat supplemental rate: unlike some states, Montana does not publish a flat percentage for bonuses. (Montana's mineral-royalty and loan-out withholding use the top marginal rate, 5.65% for 2026, but that is not employee wage withholding.)
• Local wage tax: none, on supplemental wages or regular wages.
• Employee unemployment: none, on supplemental wages or regular wages.

Federal income tax withholding on supplemental wages is a separate calculation set by the IRS, often the 22% federal flat supplemental rate, and Social Security and Medicare still apply under their own rules. For the federal supplemental math, use the Bonus Tax Calculator.

Montana Filing and Payment Frequency

Montana employers remit withheld state income tax on a schedule set by the amount withheld (accelerated, monthly, or annual), and file an annual reconciliation on Form MW-3 along with Forms W-2 and 1099 by January 31. Returns and payments are filed through the TransAction Portal (TAP). The federal deposit schedule is covered separately in the payroll tax deadlines guide.

Unemployment tax is reported and paid separately from income tax withholding, quarterly through the Department of Labor and Industry. New employees must be reported to the Montana new-hire reporting program within 20 days of the hire date.

How Take-Home Pay Works in Montana

The calculation sequence runs from gross pay down to net pay. Because Montana income tax begins with wages after pre-tax deductions, the same deductions that reduce federal wages also reduce the Montana state base.

1. Start with gross wages for the pay period.
2. Subtract federal pre-tax deductions (401(k), Section 125 health premiums) to find taxable wages for federal and Montana state tax.
3. Apply federal income tax withholding using the Form W-4 and IRS Publication 15-T.
4. Apply the two-rate Montana schedule for the Form MW-4 marital status and round the per-paycheck amount to the nearest dollar.
5. Subtract Social Security (6.2%) and Medicare (1.45%) on FICA wages. The remainder is net pay; there is no employee unemployment line, no state disability line, and no local wage line.

To see exact figures for a specific salary, filing status, and pay frequency, use the Montana paycheck calculator or the general take-home pay calculator for a full pre-tax benefits stack.

Montana Payroll Quick Facts (2026)

Frequently Asked Questions